Rotary oscillating piston pump



5 w. J. HOENECKE 2,605,714 ROTARY OSCILLATING PISTON PUMP File July 24,1948 Patented Aug. 5, 1952 ROTARY oso tta'rmc ris'rof 'J. Hcene-cke,Milwaukee, -Wis;,' 1 aissigruir of Walter one-half to 'Clyde E. Van Duser,

' Wis.

My present invention I Application Juiy 24,

relates generally to improvements in the art' oftransporting relativelyI dense fiuent materials; and relatesmore' particu larlyzto improvementsin"v the construction and operation of positive"displacementp'umps ofthe type disclosed generally inmy issued'patent, No; 2,415,592, datedFebruary 11, 194. 7, wherein some" 1948,.Serial 40,4951; 7 H H 3 Claims.(01. ice-Mo u These and other objects and advantages of the presentinvention willj be apparent from the fol-5 lowing'detailed description.Y I

'A clearconception of the'various features constituting the presentimprovement, and of the mode of constructing and of'utilizing rotaryosof the features of the present pump are covered.

It is a primary object of the present invention to provide an improvedrotary positive displacement pump of the oscillatory piston type whichis extremely simple, durable and compact in construction, and which isfurthermore highly flexible in its adaptations and efficient inoperation.

Another importantobject of my invention is to" provide f an improvedrotary oscillating piston pump adapted particularly for the handling of.relatively dense materalasuch as food-products of various types, paperpulp, sludge, concrete, and

tannery waste, and wherein the working parts are amply protected againstpossible damage.

Another specific-"object of this invention is to provide an improvedrotary positivedisplace'ment pump wherein the'm'aterial is advanced by aseries of piston members adapted to oscillateinto and out of thematerial displacementchamber, the'piston membersbeing subjected touniform pressure throughoutithe' working areas thereofwhen in activeposition.

A further specifidobject of the invention is to provide an improvedrotary positive displacement pump adapted to continuously andefliciently aid in thetransportation ofhigh density stock at extremelylow cost and with minimum attention and repairs. i

Still another specific and important object of my present invention isto provide an improved and highly effective rotary oscillating pistontype of positive displacement pump which consists of relatively fewsimple parts all of which are read-',' ily accessible, and which'maybe'quickly and easily assembled and dismantled by persons of ordinarymechanical ability. I I 7 An additionalspecific object of the presentincillatory piston pumps embodying my invention',

maybe had by referring to the drawing accom panying and'forming'a partof this specification wherein-like reference characters designate the Isame or similar parts in the several views.

ventionis to provide an improved rotary positive displacement pumpwherein a circular rotorj member is revolvable within and coaxially ofan annular displacement chamber, the rotor member being formed with anannular series of spaced substantially semi-circular pockets, each ofwhich is providedfwith a similarly shaped semi-circular piston memberpivotally mounted therein and adapted to be alternately positivelyoscillated'by means of a cam, into and out of the correspond- 55 ingpocket during normal rotation of therotor.

Fig. 1 is'aqside view of a typical rotary oscillatory piston positivedisplacement pump constructed in accordance with my invention, afragmentary 'section'havingfbeen taken along the line i'i of Fig; 2 anda major portion 'of-the outer side wall ofthe main casing having beenbroken away to reveal normally concealed mechanism; and 1,..

" is a iragmentary'transverse approximately vertical section through aportion of the improved pump taken along the .line' 2-2 of Fig.1.

While, the invention has been sh'own as being advantageously applicableto a pump especially adapted for"'the transportation of semi-liquid suchas fluent concrete, it is not'my intention to unnecessarily restrict theutility of the improved features by virtue of this limitedembodiment;andit is also contemplated that specific descrip tive terms, used hereinbe given-the broadest possible interpretationconsistent with thedisclosure.

With reference to the drawing, the improved rotary pump disclosedtherein, comprises in general a sturdy main housing-or casing formedofopposite side walls 5, 6 and a peripheral-wall I having inlet and outletports 3, 9 respectively segregated from each'other'by a partition in;

a'rotor-l l secured to a rotary drive'shaft I2 journalled' for rotation"in-bea'rings 14" mounted centrally within the side walls 5;6 andhaving'therein a peripheral recess coactin with the wall l to form anannular displacement chamber l5 spanned by the partition Hi, the rotoralso having a series of equally spaced-externally closedsemi-cylindrical pockets IS in open communicationwith the chamber 15;anoscillatory semicylindrical pistonfll snugly but'swingably' confinedwithin -each-of the pockets Hiby a pivot shaft '43 and beirig'revolvableabout-the axis of the driving shaft l2 with the rotor I I and anoscillatory quadrant cam 'l9- swingably secured to an end of each pivotshaft 18 externally of the adjacent pocket IS, the successive cams J9 being cooperablef 'with rollers Z-Elcar'riedby-the cas-- ing" wall 5toswing the corresponding pistons 4T entirely into their confining pocketsI6 as they approach the outlet port 9, and being subsequently cooperablewith a roller 2| and with an arcuate guide plate 22 also mounted withinthe wall 5 to project and maintain the successive pistons I1 across thechamber I5 after they have passed the inletport 8...=- v p Themainhousing orcasing walls 5, 6, 1 and the partition I may be fabricatedof heavy sheet metal, and one or both of the opposite side walls may befirmly but detachably secured to the pe ripheral wall 1 and partitionIII in any suitable manner so as to normally conceal while stillpermitting convenient access to the internal mechanisms and parts. Theinlet and outlet ports 8, 9 of the main housing should be .connected tosuitable sources of material supply and utilization and may also bedisposed at any desired locality with respect to; the outer wall 1 andannular chamber I; and while the inlet port 3 may be directedapproximately radially of the rotor axis, the discharge or outlet port 9is preferably directed tangentially relative to the rotor II, as shownin Fig. 1. :The rotor II may be formed. of durable metal in any suitablemanner, and is secured to the driving shaft I2 by means of one'or morekeys 24, this shaft being rotatable in the bearings I4 in any convenientmanher with its axis disposed either vertically, horizontally, or at anyangle.

The semi-cylindrical pistons I1 which snugly but swingably coact withthe similarly shaped rotor pockets I6, have curved material urging faces25 which conform with the curvature of the bottom of the rotor groovewhen the pistons concavely curved faces 21 of the successiv cams I9 areengageable with and are slidable along the peripheral surface of theplate 22 immediately after the successive pistons I1 have passed theinlet port 8 and have been swung into active position, thus positivelyholding the pistons in such position until the cam faces 21 have passedbeyond the end of the plate 22. It is to be noted, that while only oneset of cams I9 and rollers 20, 2| and guide plate 22 associated with oneside wall 5 of the casing, has been shown, a similar piston actuatingand guiding assemblage may also be associated with the opposite casingside wall 6.

When the improved pump has been properly 7 constructed and assembled ashereinbefore de- I1 are confined entirely Within their respectivepockets I6 as shown at the top of Fig. 1; and when these faces are inactive position as shown at the bottom of Fig. 1 and in Fig. 2, theyspan or project outwardly entirely across the chamber I5 thus dividingthis chamber into a succession of segregated compartments. The pistonretaining and pivot shafts I8 are J'ournalled for oscillation in theopposite side walls of the rotor II', and these shafts I8 extendoutwardly beyond one of these rotor walls as clearly shown in Fig. 2, toprovide for "attachment of the cams I9 thereto. ,Eachpiston I1 and camI9 should be rigidlyattached to the corresponding pivot shaft I8 inorder thatgoscillatory' motion of the cams will be positivelytransmitted to the pistons while the rotor II is revolving, and the camsI9 are approximately quadrant shaped but have convexly and concavelycurved actuating faces 26, 21 radiating from their pivot shafts I8 asdepicted in Fig. 1.

The cam actuating rollers 20 are journalled for free rotation on stubshafts 28 secured to the I casing sidewall 5, and the convexly curvedactuating faces 26 of the successive cams I9 are'engageable with theserollers 26 as illustrated in Fig. 1, to swing the successive'pistons I1com pletely into their confining pockets I6 as they approach the outletport 9 and while they ade Vance pastthe partition I0 and inlet port 8.The cam actuatingroller 2| is also journalled for freerotationuponanother stub shaft 29 likewise securedto the casing side wall 5, and theconcavely curved actuating faces 21 of the successive cams I9 areengageablewith this roller 2| to swing the successive pistons I1outwardly across the annular chamber-I5 aswill also be apparent fromFig. 1 1. The arcuate guide plate 22 is rigidlyattached to the interiorof the casing s dewa by m ns. f F rst a the scribed, it may be disposedin any desired position and the main shaft I2 may be drivingly connectedto a suitable source of power while the inlet port 8 should be placed incommunication with a fluent material supply source and the outlet port 9should likewise be placed in communication'with a source of utilizationof the transported material. Asthe shaft I2 rotates, it rotates therotor II and revolves the pistons I1 and cams I9 within the peripheralcasing wall 1, thereby'causing the revolving pistons I1 to trans- Portthe successive batches of fluent'material entering the annulardisplacement chamber I5 through the inlet port 8, toward the outlet port9 in the form of a continuous succession of segregated batches eachconfined between two successive active pistons. The guide plate 22coacting with the concave cam faces 21 positively holds the pistons I1in active position across the chamber I5; but whenever a piston I1 hasadvanced toward the outlet port 9 to a position wherein its cam I9 hasmoved beyond the end of the retainer plate 22, and the actuating camsurface 26 thereof engages the rollers 20, then the piston isautomatically swung entirely into its confining pocket I6 and the batchof material in back of the displaced piston merges with the constantstream of fluid being forced through the outlet. This recession of thesuccessive pistons I1 continues until after they have passed the outletport 9, partition I0 and inlet port 8, at which time the roller 2|automatically swings them back into active position for subsequentrepetition of similar cycles of-operation.

From the foregoing detailed description, it will be apparent that mypresent invention in fact provides an improved rotary oscillating pistonpump which besides being simple and compact in construction, is alsohighly efficient in operation and flexible in its adaptations. Thepumping action is effected by positive displacement of the successivebatches of material along the displacement chamber I5 bythe revolvingpiston I1, and semi-cylindrical formation .of these pistons andtheoscillatory mounting of the pistons I1 upon central pivot shafts I8insures the production and distribution of uniform pressure cessivewear. and the rollers 20, -2I may becon veniently lubricated from theexterior of the housing through their supporting shafts 28, 29 in anobvious manner. The functioning of the improved pump is entirelyautomatic and the cam and roller mechanisms are amply protected withinthe casing, while the entire assemblage comprises only few very simpleparts which may be durably constructed and readily assembled at moderatecost. The improved pumps may be manufactured in diverse sizes forvarious uses and are especially adapted for the transportation ofrelatively dense liquids such as concrete and semi-fluent foods.

It should be understood that it is not desired to limit this inventionto the exact details of construction or to the precise mode of operationand use of the typical concrete pump herein shown and described, forvarious modifications within the scope of the appended claims may occurto persons skilled in the art.

I claim:

1. In a rotary positive displacement pump, a casing having therein anannular displacement chamber provided with segregated inlet and outletports and with a rotor having a series of semi-cylindrical pockets inopen communication with the chamber, a semi-cylindrical piston confinedwithin each of said pockets, each of said pistons having a pivot shaftjournalled in and extending through at least one of the side Walls ofits pocket for oscillation about its central axis and being revolvablewith said rotor, a quadrant cam secured to the pivot shaft of each ofsaid pistons externally of its confining pocket for swinging the pistonabout its axis entirely into its pocket and for projecting it acrosssaid chamber, each of said pistons and its actuating cam having coaxialarcuate peripheral faces and each quadrant cam also having a pair ofapproximately radial bounding edges, and means co operable with said camedges to swing said pistons from one extreme position to the other whenapproaching and leaving said outlet and inlet ports respectively.

2. In a rotary positive displacement pump, a casing having therein anannular displacement chamber provided with segregated inlet and outletports and with a rotor having a series of semi-cylindrical pockets inopen communication with the chamber, a semi-cylindrical piston confinedwithin each of said pockets, each of said pistons having a pivot shaftjournalled in and extending through at least one of the side walls ofits pocket for oscillation about its central axis and being revolvablewith said rotor, a quadrant cam secured to the pivot shaft of each ofsaid pistons externally of its confining pocket for 6 swinging thepiston about its axis entirely into its pocket and for projecting itacross said chamber, each of said pistons and its actuating cam havingcoaxial arcuate peripheral faces and each quadrant cam also having apair of approximately radial bounding edges, abutment means cooperablewith one of the radial bounding edges of each of said cams to swing saidpistons into inactive position when approaching said outlet port, andother abutment means cooperable with the other radial bounding edge ofeach of said cams to swing said pistons into active position whenleaving said inlet port.

3. In a rotary positive displacement pump, a casinghaving therein anannular displacement chamber provided with segregated inlet and outletports and with a rotor having a series of semi-cylindrical pockets inopen communication with the chamber, a semi-cylindrical piston confinedwithin each of said pockets, each of said pistons having a pivot shaftjournalled in and extending through at least one of the side walls ofits pocket for oscillation about its central axis and being revolvablewith said rotor, a quadrant cam secured to the pivot shaft of each ofsaid pistons externally of its confining pocket for swinging the pistonabout its axis entirely into its pocket and for projecting it acrosssaid chamber, each of said pistons and its actuating cam having coaxialarcuate peripheral faces and each quadrant cam also having a pair ofapproximately radial bounding edges, a segmental guide plate mounted ona side wall of said casing and cooperable with one of the radialbounding edges of each of said cams to maintain said pistons in activeprojected position, and abutment means also mounted on the casing sidewall between the ends of said plate and cooperable with the other ofsaid cam edges to swing said pistons into inactive position.

. WALTER J. HOENECKE.

REFERENCES CITE!) The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 23,764 Freeman Apr. 26, 1859738,101 Curtis Sept. 1, 1903 2,151,484 Nordling Mar. 21, 1939 2,157,141Murray May 9, 1939 FOREIGN PATENTS Number Country Date 452,835 GermanyNov. 21, 1927

